You were rocking around the school during a free period and found a young girl singing.
???:
(Y/N): Oh, that must be Kusuri. Doing science is always fun when singing a song!
You walked in and caught what looked like a little girl, singing, and dancing while holding chemicals!
(Y/N): Hi Kusuri!
Kusuri: Oh hi (Y/N)! It's nice for you to join Kusuri! Kusuri has some new drugs for you to test, Yep!
Kusuri Yakuzen (An Upperclassman who is a master of chemicals which she refers to as drugs! She looks like this because of a failed immortality potion! She is pretty crazy but also really fun! She chooses this because it's easier to do science that way!)
(Y/N): Okay, lay them on me.
She hands you a drug, and you drink it, and a bunch of small metal objects begin to attach themselves to you!
Kusuri: This is Kusuri's Magnetization Drug! Yep! This turns the iron in your blood into magnetized which allows metal objects to attach to you!
(Y/N): Neat!
Kusuri: Now, if Kusuri drinks the drug of a different polarity.
She then did so and attached herself to you.
Kusuri: This is nice, Yep!
(Y/N): Yeah, I guess so.
Kusuri: ...
(Y/N): ... Kusuri: Kusuri has to pee.
(Y/N): Then go!
Kusuri: Kusuri can't! We can't split up until we take the neutralization drug in 10 minutes, Yep! Yep!
(Y/N): CAN'T YOU HOLD IT FOR THOSE 10 MINUTES?!
Kusuri: That's what Kusuri's diaper is for! Yep! Yep!
(Y/N): NO! I WILL NOT GET PISSED ON! YOU HAVE TO HOLD IT!
Kusuri: It could get worse, Yep!
(Y/N): HOW?!
Kusuri: Kusuri could have drunk a drug of the same polarity, and Kusuri's crotch would be in your face! Yep!
(Y/N): Yeah, I suppose that is a bit worse, considering the context here.
10 minutes later...
(Y/N): OH THANK GOD! YOU DIDN'T PISS ON ME!
Kusuri: Kusuri could have held it after all, Yep!
(Y/N): So, is there anything else you need because I might need to take a shower after this?
Kusuri: Well, there is one thing, Yep!
She drank an entire vial when she turned into another form which was her true form!
Kusuri: Much better.
(Y/N): (blushing) What is Kusuri?
Kusuri: Kusuri wants to do this!
She began to make out with you, and-
Kusuri: Kusuri wants in the harem.
(Y/N): Great.
You both continued making out with each other, and you blushed hard.
(Y/N): GOD! SHE'S GOT BOOBS THE SIZE OF MEDAKA!